Tanks typically fulfill a variety of battlefield roles, such as engaging infantry or providing mobile striking power much like pre-modern cavalry. Tank destroyers, while superficially similar, are specialized for destroying enemy tanks (as the name implies). To the end, they are often mounted with an artillery gun or missile launcher. One of the most unique tank destroyer designs was the Bristish 1944 Archer. Its gun faced backward, allowing it to mount ambushes and withdraw to a better position without having to turn around!